Touch Circuit Modules for Low Power In-Cell Displays
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Solution Overview
Problem
Existing touch circuits for in-cell touch panels have complex structures and high power consumption, which limits their application in large-size, narrow-frame display screens.
Innovation Solution
A touch circuit design comprising an input module, reset module, pull-up module, pull-down module, pull-down control module, and touch signal output module, with a simplified structure using fewer thin film transistors, which reduces power consumption and simplifies the circuit architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional touch circuit structure is used, then the touch function can be realized, but the circuit structure becomes complicated and power consumption increases
Solution Approach 1:
The touch circuit is divided into six functional modules: input module, reset module, pull-up module, pull-down module, pull-down control module, and touch signal output module. Each module performs a specific function, allowing the complex touch circuit to be decomposed into manageable segments that can be designed and analyzed independently while maintaining overall system reliability.
Solution Approach 2:
The touch circuit modules are designed to perform multiple functions. For example, the pull-up module not only pulls up the signal but also participates in the timing control, and the pull-down control module manages both signal levels and timing. This multi-functionality reduces the total number of components needed, simplifying the overall circuit structure while maintaining touch functionality.
2Reliability
If a traditional touch circuit structure is used, then the touch function can be realized, but power consumption becomes high
Solution Approach 1:
The touch circuit employs periodic clock signals (first clock signal and second clock signal) to control the timing of signal transmission and processing. By using periodic action, the circuit can efficiently manage power consumption by activating components only when needed during specific time periods, rather than maintaining continuous operation, thus reducing overall power usage while ensuring reliable touch detection.
3Use of energy by stationary object
If the touch circuit structure is simplified, then power consumption is reduced, but the touch signal output efficiency may be affected
Solution Approach 1:
The circuit performs preliminary actions by pre-charging and pre-discharging nodes through the pull-up and pull-down modules before actual touch signal detection. This preliminary preparation ensures that when a touch event occurs, the signal can be detected and processed immediately without delay, maintaining high output efficiency even with a simplified circuit structure and reduced power consumption.
Data Source
AI summary
There are provided a touch circuit, a touch panel and a display apparatus. The touch circuit comprises: an input module (1), a reset module (2), a pull-up module (3), a pull-down module (4), a pull-down control module (5) and a touch signal output module (6), wherein the input module is configured to provide a signal of the first reference signal terminal to the first node; the reset module is configured to provide a signal of the second reference signal terminal to the first node; the pull-up module is configured to provide a signal of the first clock signal terminal to the control signal output terminal; the pull-down module is configured to provide a signal of the third reference signal terminal to the control signal output terminal; the pull-down control module is configured to ensure a potential of only one node of the first node and the second node is a first potential at a same moment; the touch signal output module is configured to output a high frequency signal or a common voltage signal to a touch signal output terminal under the control of the control signal output terminal. The touch circuit, the touch panel and the display apparatus have a simple structure, and relatively low power consumption.